关键词: 爆破振动, 高程差, 高程放大效应, 现场测试

Abstract: Taking an open-pit iron mine of Magang Group as an example,the blasting vibration in-situ test method is carried out to study the blasting vibration propagation law by considering the elevation factor,from the aspects of slope stability and surrounding buildings safety under the influence of blasting vibration.The modified Sadowski formula is proposed by using dimension analysis method.The study results show that with the increasing of elevation difference,the "whipping effect" of blasting vibration velocity is existed on the rock mass in the bench,that is to say,the "whipping effect" is equals to height amplification effect;with the increasing of the horizontal distance of measurement points and explosive source,the attenuation law of the amplification coefficient of blasting vibration is presented,and the amplification coefficient is significant in the horizontal distance range of 300 m;with the increasing of evaluation difference,the blasting vibration is mainly attenuated,the evaluation amplification effect is increased gradually with the increasing of evaluation difference,the evaluation amplification coefficient is increased rapidly in the evaluation difference range of 200 m,it tends to stable after 500 m;the blasting vibration hazard is increased by the existence of evaluation difference.The prediction accuracy of blasting vibration velocity is improved by adopting the modified Sadowski formula proposed in this paper,which has some guidance significance for safety controlling of stope slope and its surrounding facilities.

Key words: Blasting vibration, Elevation difference, Elevation amplification effect, Field test